Quarterly report pursuant to Section 13 or 15(d)

VIEs - Low Income Housing Tax Credit Partnerships (Details)

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VIEs - Low Income Housing Tax Credit Partnerships (Details) - Variable Interest Entity, Not Primary Beneficiary - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Affordable Housing Tax Credit Partnerships          
Variable Interest Entity [Line Items]          
Affordable housing tax credit investments $ 2,134   $ 2,134   $ 1,568
Less: amortization (698)   (698)   (612)
Net affordable housing tax credit investments 1,436   1,436   956
Unfunded commitments 774   774   $ 500
Tax credits and other tax benefits recognized 36 $ 29 113 $ 88  
Proportional Amortization Method          
Variable Interest Entity [Line Items]          
Proportional amortization expense included in provision for income taxes $ 34 $ 25 $ 92 $ 75